Endoscope



F. F. LEITER ENDOSCOPE ,Filed Apfrii 29. 1925 PI FFECE FRIEDRICH FERDINAND LEITER, OF VIENNA, AUSTRIA ENDoscorn i Application ed April 29, 1925, Serial No. 26,646, and in Austria June 12, 1923.

This invention relates to cystoscopes, endoscopesyand instruments of this class. Instruments of this class are known Which have sheaths of such diameter that one can insert `5 either a telescope of great calibre and high ,1' magnifying power, or a 'thin optical system, and also comprising an instrument for urethral catheterization and operative Work in the lvesical interior. These cystoscopes show certain drawbacks because of loss of the Blatter-filling When the obturator, or the optical systems, are changed. The automatic valves hitherto used Jfor effecting such changes do not act in a satisfactory manner. The present invention has for its object to provide an improved endoscope free from ,the above mentioned disadvantages and Will Inow be described with reference to the accompanying drawing in which,

Fig. l is a view of a lens system employed in the endoscope ot the invention. ',f. In order to make is possible that the endoscope (cystoscope) may be sterilized in boiling water, I have provided a nev.-v telescope system illustrated in the drawing. T he system comprises a prism la which isnann entifafifzlen reflecting prisif'th-iiieit'ing ridgegtypg Whoj cow, t o neupieeeh In this systiii l5l is the collecting lens and 1G and 17a Pl'f 30h101111tl9 ..l9l1bl ls by which the imagiipfoduced by the collecting lens is inverted and a real image again reproduced, 18 is a second collecting lens, 19 and a" Q0 a second pair ot' aehromatic double lenses, M 21, and 22 an eye piece of the Ramsdenor WI-Inygens-type. f The main feature ot the new telescope system lies in that the lens-systemgsginpwlnwding 49 the halves otthefc -lensjes ofthe aghi-o;

mat-ic units by Whiclrthe image is inverted, htlehi-9rthrei9r .mereileaseni .dfl ,sortsV of glassjvhich are not cemented and are arranged at short distances from one another. With this arangement the rays 1 have the same path and limitation as usual with such instruments.

tiza @ma fable manner@ Opb'ystin tor inverting the image, by using lenses'which 1th a ob]ect1\e lens, them.

Itj. ia s already been proposed to achromaare not cemented and consist of different vf-K U.- i. u.. It ..V

"shown in the drawing but also with any other endoscopic telescope since as already mentioned the path and limitation of the rays is not altered in the least.

I claim: l. In an instrument of the class described, a system of achromatizing lenses for reversing the image comprising a multiplicity of non-cemented lenses of different kinds of glass arranged apart at a distance not greater than the diameter of the lenses.

2. In an instrument of the class described, a system of achromatizing pairs of lenses for reversing the image comprising a multiplicity of non-cemented lenses of diiterent kinds of glass arranged apart at a distance not greater than the diameter of the lenses. 3. In an instrument of the class described, a system of achromatizing lenses for reversing the image comprising a multiplicity of non-cemented lenses of diiierent kinds of glass arranged apart at a distance not greater than the thickness of the lenses.

4. In an instrument of the class described,

ns-num.

voptical parts adapted to present to the observer an image of the part of the body to be. examined, which optical parts comprise lens systems composed of a plurality of lenses, the single members of these systems consisting of diferent kinds of glass in order to achieve chromatic correction, not beingpcemented and positioned in spaced relation ivith respect to each other. l

FRIEDRICH FERDINAND LEITER. 

